AQA GCSE Combined Science Trilogy Chemistry, Higher tier sample questions and answers (8464)
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50 sample questions and answers
Taken from every topic of AQA GCSE Combined Science Trilogy Chemistry, Higher tier, specification 8464. The full guide has 1,222.
Chemistry Paper 1
Atomic Structure and the Periodic Table
192 questions in the guide, across 14 subtopics. More from this topic
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Atoms, elements and compounds
What is the chemical symbol for an atom of oxygen?
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The symbol for oxygen is O. -
Word equations, symbols and balanced equations
What does a half equation show?
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It shows the electrons lost or gained by one species in a reaction. -
From the plum pudding model to the nuclear model
Which experiment provided the evidence that led to the nuclear model?
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The alpha particle scattering experiment. -
Bohr, Chadwick and the modern model of the atom
State two differences between the plum pudding model and the nuclear model.
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In the nuclear model the positive charge and nearly all the mass sit in a tiny central nucleus, and most of the atom is empty space, whereas in the plum pudding model the positive charge fills the atom with electrons embedded in it. -
Size and mass of atoms
What is the relative mass of a proton?
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It is 1.
Chemistry Paper 1
Bonding, Structure, and the Properties of Matter
175 questions in the guide, across 12 subtopics. More from this topic
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Chemical bonds, including metallic bonding
Magnesium oxide is made from magnesium and oxygen. Name its type of bonding and give a reason.
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Ionic bonding, because it is a compound of a metal with a non-metal. -
Ionic bonding
How does the group number of a Group 2 metal relate to the charge on its ion?
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It has two outer electrons to lose, so it forms a 2+ ion. -
Covalent bonding and how it is represented
What does a ball and stick model of a molecule show that a dot and cross diagram does not?
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The shape of the molecule and how its bonds are arranged in space. -
The three states of matter and changes of state
Why does one substance have a much higher boiling point than another?
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The forces between its particles are stronger, so more energy is needed to separate them. -
Properties of ionic compounds
Are the boiling points of ionic compounds high or low, and why?
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High, because many strong bonds between the ions have to be broken.
Chemistry Paper 2
Chemical Analysis
51 questions in the guide, across 4 subtopics. More from this topic
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Pure substances
What is the difference between the way a pure compound changes state and the way a mixture does?
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A pure compound melts and boils at specific fixed temperatures, while a mixture melts and boils over a range of temperatures. -
Pure substances
What does the word pure usually mean in everyday speech?
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It means the substance has had nothing added to it, so it is unadulterated and in its natural state. -
Formulations
Name three household products that are formulations.
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Paints, medicines and cleaning agents are all formulations. -
Formulations
A label lists five ingredients together with the percentage of each. What does this suggest about the product?
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It is a formulation, because it is a mixture whose components are present in carefully measured proportions. -
Chromatography
A spot moves 3.6 cm from the origin while the solvent moves 8.0 cm. Calculate its Rf value.
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Rf is 3.6 ÷ 8.0, which is 0.45.
Chemistry Paper 1
Chemical Changes
177 questions in the guide, across 10 subtopics. More from this topic
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The reactivity series
State the rule that decides whether one metal will take another metal's place in a compound.
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A more reactive metal displaces a less reactive metal from its compound. -
Metal oxides, extraction, and redox in terms of electrons
In what form are most metals found in the Earth, and what does this mean must be done to obtain them?
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They are found as compounds, so a chemical reaction is needed to separate the metal from what it is joined to. -
Acids reacting with metals, neutralisation and salts
When magnesium reacts with hydrochloric acid, what happens to the hydrogen from the acid?
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It is reduced to hydrogen gas, which bubbles out of the solution. -
Soluble salts
How is a solid salt obtained from a solution of that salt?
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The solution is crystallised. -
The pH scale and neutralisation
What is the full range of the pH scale?
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It runs from 0 to 14.
Chemistry Paper 2
Chemistry of the Atmosphere
115 questions in the guide, across 6 subtopics. More from this topic
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The Earth's early atmosphere
Which gas is thought to have made up most of the Earth's early atmosphere?
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Carbon dioxide. -
The Earth's early atmosphere
Name two gases thought to have been present in small proportions in the early atmosphere.
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Methane and ammonia. -
How oxygen increased and carbon dioxide decreased
What happened to oxygen in the atmosphere soon after algae began to photosynthesise?
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Oxygen began to appear in the atmosphere and its percentage started to rise. -
How oxygen increased and carbon dioxide decreased
Describe the main changes in the composition of the atmosphere over the Earth's history.
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Carbon dioxide fell from being the main gas to a very small proportion, oxygen rose to about a fifth, and nitrogen built up to about four-fifths. -
The gases in today's atmosphere, and which are greenhouse gases
Name three kinds of gas that are present in the atmosphere only in small proportions.
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Carbon dioxide, water vapour and the noble gases.
Chemistry Paper 1
Energy Changes
65 questions in the guide, across 4 subtopics. More from this topic
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Exothermic and endothermic reactions
A student mixes two solutions in a beaker and the beaker becomes warm. What type of energy change has taken place?
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An exothermic change, because energy has been transferred from the reaction to the surroundings. -
Exothermic and endothermic reactions
Give two everyday products that make use of exothermic reactions.
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Self-heating cans and hand warmers. -
Everyday uses, and investigating temperature change
Why does a thermometer standing in a reaction mixture tell you about the energy change of the reaction?
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It records the temperature of the surroundings of the reacting particles, which rises when energy is given out and falls when energy is taken in. -
Everyday uses, and investigating temperature change
Name four kinds of reaction between solutions that are suitable for investigating temperature change.
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An acid with a metal, an acid with a carbonate, a neutralisation, and the displacement of one metal by another from its salt solution. -
Reaction profiles
What three things can a reaction profile show about a reaction?
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The relative energies of the reactants and products, the activation energy, and the overall energy change.
Chemistry Paper 2
Organic Chemistry
84 questions in the guide, across 5 subtopics. More from this topic
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Crude oil, hydrocarbons and alkanes
Which type of compound makes up most of crude oil?
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Hydrocarbons. -
Crude oil, hydrocarbons and alkanes
What does a molecular formula such as C₃H₈ tell you about an alkane?
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It gives the number of carbon atoms and the number of hydrogen atoms in one molecule, but not how they are joined. -
Fractional distillation and petrochemicals
What is meant by feedstock in the petrochemical industry?
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Feedstock is the raw material fed into the industry and used to make other chemicals. -
Fractional distillation and petrochemicals
What is a homologous series?
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A homologous series is a family of similar compounds that share the same general formula and have similar chemical properties. -
Properties of hydrocarbons
How does viscosity change as hydrocarbon molecules get larger?
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Viscosity increases, so the liquid flows less easily.
Chemistry Paper 1
Quantitative Chemistry
101 questions in the guide, across 6 subtopics. More from this topic
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Conservation of mass and balanced chemical equations
Explain why chemical reactions can be represented by balanced symbol equations.
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Because no atoms are lost or made, the number of atoms of each element must be the same on both sides of the equation. -
Conservation of mass and balanced chemical equations
What is the difference between a number written in normal script in front of a formula and a number written in subscript inside a formula?
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A number in front multiplies the whole formula that follows it, while a subscript multiplies only the atom or bracketed group it comes after. -
Relative formula mass and concentration of solutions
How is the percentage by mass of an element in a compound calculated?
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Divide the total relative atomic mass of that element in the formula by the relative formula mass of the compound, then multiply by 100. -
Relative formula mass and concentration of solutions
12 g of a solid is dissolved and the solution made up to 0.5 dm³. What is its concentration in g/dm³?
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24 g/dm³. -
Mass changes when a gas is involved, and measurement uncertainty
What is always true about the result of any measurement that is made?
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There is always some uncertainty in the value obtained.
Chemistry Paper 2
The Rate and Extent of Chemical Change
150 questions in the guide, across 10 subtopics. More from this topic
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Measuring the mean rate of a reaction
A reaction uses up 2.4 g of magnesium in 60 s. Calculate the mean rate of reaction.
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2.4 g ÷ 60 s = 0.04 g/s. -
Rate from graphs, and the gradient of a tangent
Two reactions are followed on the same axes of gas volume against time. State how you can tell from the curves which reaction is faster at the start.
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The reaction whose curve is steeper at the start is the faster one. -
Factors which affect the rates of chemical reactions
State the effect on the rate of reaction of using a powdered solid in place of a single lump of the same mass.
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The rate of reaction increases. -
Collision theory and activation energy
Explain the two reasons why raising the temperature increases the rate of a reaction.
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The particles move faster so they collide more frequently, and a greater proportion of the collisions have at least the activation energy. -
Catalysts
Explain why enzymes are described as catalysts.
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They speed up reactions in biological systems and are not used up by those reactions.
Chemistry Paper 2
Using Resources
112 questions in the guide, across 7 subtopics. More from this topic
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Using the Earth's resources and sustainable development
Suggest why an industrial process that uses less energy and makes less waste is described as more sustainable.
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It uses up fewer limited resources and causes less environmental damage, so more is left for future generations. -
Using the Earth's resources and sustainable development
What is a frequency table?
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A table that records how many times each value, or each group of values, occurs in a set of data. -
Producing potable water in the UK
Why is potable water not produced in the same way everywhere in the world?
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The method chosen depends on the water supplies that are available locally and on local conditions. -
Producing potable water in the UK
What is removed from water as it passes through filter beds?
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Insoluble solids such as grit, sand and other suspended particles. -
Desalination, and analysing water samples
Explain why filtration is carried out before sterilising rather than after.
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Filtering first removes solids that would shelter microbes and use up the sterilising agent, so sterilising then works properly.
AQA GCSE Combined Science Trilogy Chemistry, Higher tier Active Recall Guide
The other 1,172 questions, with the answers printed after each section.